Method for enhanced dedicated channel (e-dch) transmission overlap detection for compressed mode gap slots

ABSTRACT

A method and apparatus for detecting an overlap of an E-DCH transmission or retransmission in TTIs that overlap with an assigned uplink compressed mode gap is disclosed. More specifically, detecting an overlap of an E-DCH transmission or retransmission in TTIs that overlap with an uplink compressed mode gap assigned by a Node B when a WTRU is configured with a 2 ms TTI is disclosed. After detecting the overlap of the E-DCH transmission or retransmission and the uplink compressed mode gap, the E-DCH transmission or retransmission is paused.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional PatentApplication No. 60/826,277 filed Sep. 20, 2006, which is incorporated byreference as if fully set forth.

FIELD OF INVENTION

The present invention is directed toward wireless communication systems.More particularly, the present invention is related to frequencydivision duplex (FDD) compressed mode operation in a Third GenerationPartnership Project (3GPP) Release 6 wireless transmit/receive unit(WTRU) using an enhanced dedicated channel (E-DCH) and implementing 3GPPRelease 6 hardware and software.

BACKGROUND

The enhanced dedicated channel (E-DCH) is a new feature employed in the3GPP Release 6 FDD systems. The E-DCH is an uplink transport channel.The technical purpose of the E-DCH is to improve the performance ofdedicated transport channels by increasing channel capacity, increasingchannel throughput, and reducing delays with the deployment of smallerCDMA spreading factors and multiple channelization codes. Further, theE-DCH permits transmission scheduling and power management for WTRUs incommunication with a Node B. For example, the E-DCH facilities highspeed uplink transmission capability up to 5.76 Mbps and provides asignificant improvement in performance. The E-DCH also maintains theregular mobility functions of a WTRU, such as performing measurementsover neighboring cells for a handover operation or preparation for cellreselection.

According to the E-DCH feature, the Node B first assigns an uplinkcompressed mode gap pattern to a WTRU. Then, the WTRU performs E-DCHuplink transmissions over the E-DCH. When a WTRU is configured with a 2ms transmission time interval (TTI), the WTRU does not perform E-DCHuplink transmissions and retransmissions in TTIs that overlap with anuplink compressed mode gap. When a WTRU is configured with a 10 ms TTI,the WTRU adjusts a serving grant and scales back the power of E-DCHuplink transmissions and retransmissions in TTIs that overlap with anuplink compressed mode gap.

The Node B may assign the uplink compressed mode gaps at differentpositions in a radio frame. For example, the Node B may position theuplink compressed mode gaps for the purpose of inter-frequency orinter-RAT power measurement, the acquisition of a control channel of adifferent system or carrier, or an actual handover operation.

FIG. 1 a and FIG. 1 b are diagrams of a compressed mode gap position ina radio frame. A radio frame may be either a universal mobiletelecommunications system (UMTS) or a wideband code division multipleaccess (WCDMA) radio frame.

As shown in FIG. 1 a and FIG. 1 b, the network may position compressedmode gaps in a radio frame using one of two methods. FIG. 1 a shows acompressed mode gap 110 positioned within a radio frame 120 using asingle-frame method. In the single-frame method, a compressed mode gapis positioned within a radio frame depending on a transmission gaplength (TGL). FIG. 1 b shows a compressed mode gap 130 positioned at theend of a first radio frame 140 and the beginning of a second radio frame150 using a double-frame method.

The Node B assigns the uplink compressed mode gaps using a TGL. The TGLis the number of consecutive idle time slots during a compressed modegap. The idle time slots in a compressed mode gap are consecutivewhether the compressed mode gap is positioned using a single-framemethod or a double-frame method. Each time slot within a radio frame isnumbered (N) and ranges from 0 to 14. The number of the first idle timeslot of the consecutive idle time slots is N_(first). The number of thelast idle time slot of the consecutive idle time slots is N_(last). IfN_(first)+TGL≦15, then N_(last)=N_(first)+TGL−1 in the same radio frame.If N_(first)+TGL>15, then N_(last)={(N_(first)+TGL−1) mod 15} in thenext radio frame. When the compressed mode gap spans two consecutiveradio frames, the N_(first) and the TGL must be chosen such that atleast 8 time slots in each radio frame are transmitted.

FIG. 2 a and FIG. 2 b are diagrams of a compressed mode gap positionhaving different starting time slots in a radio frame. As shown in FIG.2 a and FIG. 2 b, the Node B may position compressed mode gaps in aradio frame using one of two methods. In FIG. 2 a, using a single-framemethod, the Node B may position a compressed mode gap within the radioframe 220 in different positions 210, 212, 214 using a differentN_(first). In FIG. 2 b, using a double-frame method, the Node B mayposition a compressed mode gap at the end of a first radio frame 240 andthe beginning of a second radio frame 250 in different positions 230,232, 234 using a different N_(first).

As stated above, a WTRU configured with a 2 ms TTI does not performE-DCH uplink transmissions or retransmissions in TTIs that overlap withan assigned uplink compressed mode gap. All E-DCH uplink transmissionsor retransmissions in TTIs that overlap with the assigned uplinkcompressed mode gap are paused. Further, there is no need to perform anynew transmission related functions, such as evolved transport formatcombination (E-TFC) selection, multiplexing processing, etc.Additionally, there are no hybrid automatic repeat request (H-ARQ)transmissions or retransmissions in a TTI that overlaps with an uplinkcompressed mode gap. If an H-ARQ process is scheduled to retransmitduring an overlapping TTI, then the H-ARQ process is also paused.

Therefore, there exists the need to meet the 3GPP compressed modeoperation requirements and E-DCH uplink specific transmissioncharacteristics when a WTRU is configured with a 2 ms TTI. As a result,it would be desirable to permit detection of an overlap of E-DCH uplinktransmissions or retransmissions in TTIs that overlap with an assigneduplink compressed mode gap.

SUMMARY

A method and apparatus for detecting an overlap of an E-DCH transmissionor retransmission in TTIs that overlap with an assigned uplinkcompressed mode gap is disclosed. More specifically, detecting anoverlap of an E-DCH transmission or retransmission in TTIs that overlapwith an uplink compressed mode gap assigned by a Node B when a WTRU isconfigured with a 2 ms TTI is disclosed. After detecting the overlap ofthe E-DCH transmission or retransmission and the uplink compressed modegap, the E-DCH transmission or retransmission is paused.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing summary, as well as the following detailed description ofthe preferred embodiments will be better understood with references toappended drawings, wherein:

FIG. 1 a and FIG. 1 b are diagrams of a compressed mode gap position ina radio frame;

FIG. 2 a and FIG. 2 b are diagrams of a compressed mode gap positionhaving different starting time slots in a radio frame;

FIG. 3 is a diagram of a radio frame configured for E-DCH operation;

FIG. 4 is a block diagram of a wireless communication system configuredin accordance with the present invention;

FIG. 5 is a diagram of an uplink compressed frame gap description map;

FIG. 6 is a flow diagram of a method for detecting the overlap of 2 msE-DCH transmissions and compressed mode gap slots;

FIG. 7 is a diagram of an E-DCH subframe overlap description map; and

FIG. 8 is a flow diagram of a method for detecting the overlap of anE-DCH subframe and a compressed mode transmission gap.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereafter, a wireless transmit/receive unit (WTRU) includes but is notlimited to a user equipment (UE), mobile station, fixed or mobilesubscriber unit, pager, or any other type of device capable of operatingin a wireless environment. When referred to hereafter, a base stationincludes but is not limited to a Node-B, site controller, access pointor any other type of interfacing device in a wireless environment.

The features described herein may be incorporated into an integratedcircuit (IC) or be configured in a circuit comprising a multitude ofinterconnecting components.

FIG. 3 is a diagram of a radio frame 300 configured for E-DCH operation.The radio frame 300 contains a plurality of time slots and a pluralityof E-DCH subframes. Each of the E-DCH subframes within the radio frame300 has a TTI of 2 ms.

As shown in the FIG. 3, each radio frame 300 comprises fifteen timeslots numbered 0 to 14. The fifteen time slots are grouped into fiveE-DCH subframes 310, 311, 312, 313, 314. The five E-DCH subframes may beidentified as subframe #0 to subframe #4. The first E-DCH subframe 310,subframe #0, starts at the beginning of the radio frame 300 at time slot0. The last E-DCH subframe 314, subframe #4, ends with radio frame 300at time slot 14. Each of the E-DCH subframes is synchronized with thetime slots in the radio frame 300 and is recycled with each radio frame300.

Each of the E-DCH subframes consists of three time slots. Each of thethree time slots in the E-DCH subframe may be denoted by the following:N _(e-ts-first)=3*E-DCH subframe #  (Equation 1)N _(e-ts-middle)=3*E-DCH subframe #+1   (Equation 2)N _(e-ts-last)=3*E-DCH subframe #+2   (Equation 3)where the E-DCH subframe # ranges from 0 to 4 to indicate the five E-DCHsubframes within each radio frame 300. For example, the third E-DCHsubframe, E-DCH subframe #2, in a radio frame starts at time slot 6, hasa middle time slot 7, and ends at time slot 8. Therefore, each E-DCHsubframe has a starting time slot, N_(e-ts-first,) and an ending timeslot, N_(e-ts-last,) that may be used to detect the overlap of an E-DCHtransmission with an uplink compressed mode transmission gap.

FIG. 4 is a block diagram of a wireless communication system 400including a wireless transmit/receive unit (WTRU) 402 and a Node B 404.The WTRU 402 and the Node B communicate using radio resource control(RRC) signaling. As stated above, the WTRU and the Node B implement 3GPPRelease 6 hardware and software and support the E-DCH feature.

As shown in FIG. 4, the WTRU 402 includes a processor 410, a transmitter412, a receiver 414, and a memory 416.

The processor 410 is configured to process a received uplink compressedmode gap pattern, generate an uplink compressed frame gap descriptionmap, and detect the overlap of E-DCH transmissions and a compressed modetransmission gap. The processor 410 is further configured to store thegenerated uplink compressed frame gap description map in the memory 416.The uplink compressed frame gap description map is further describedbelow.

The transmitter 412 is configured to transmit enhanced dedicated channel(E-DCH) transmissions from the WTRU 402 to the Node B 404. The receiver414 is configured to receive the uplink compressed mode gap pattern whenthe uplink compressed mode is activated by the Node B. The uplinkcompressed mode gap pattern includes at least one uplink compressed modetransmission gap.

The memory 416 is configured to store the uplink compressed frame gapdescription map generated by the processor 410. The stored uplinkcompressed frame gap description map is used by the WTRU to facilitatefurther compressed mode operation.

In an alternative embodiment, the processor 410 is further configured togenerate an E-DCH subframe overlap description map and check the overlapof E-DCH subframes in an E-DCH transmission and compressed modetransmission gaps.

The processor is further configured to store the uplink compressed framegap and subframe overlap description map in the memory 416. The uplinkcompressed frame gap and subframe overlap description map is furtherdescribed below.

Still referring to FIG. 4, the Node B 404 includes a processor 420, atransmitter 422, and a receiver 424. The processor 420 is configured toactivate the uplink compressed mode.

The transmitter 422 is configured to transmit an uplink compressed modetransmission gap pattern to the WTRU 402 using radio resource control(RRC) signaling. The uplink compressed mode gap pattern comprises acompressed mode transmit gap slot pattern, a frame number of the radioframe in which the uplink compressed mode begins, and the length of theuplink compressed mode transmission gap pattern. Each transmission gapconsists of a number of consecutive time slots whether the transmissiongap is a single-frame gap or a double-frame gap. The time slots within atransmission gap may be referred to as a gap slot.

The uplink compressed mode transmit gap slot pattern is signaled using atransmission gap starting slot number (TGSN), a transmission gap length(TGL), and a transmission gap pattern length (TGPL). The TGSN is theslot number of the first transmission gap slot within the first radioframe of the transmission gap pattern. The TGL is the duration of thetransmission gap within the transmission gap pattern represented in anumber of time slots. The TGPL is the duration of a transmission gappattern represented in a number of frames.

The frame numbers of the radio frame in which the uplink compressed modetransmission gap begins and the length of the compressed mode transmitgap pattern are signaled using a transmission gap connection framenumber (TGCFN) and a transmission gap pattern repetition count (TGPRC).The TGCFN is the CFN of the first radio frame of the first patternwithin the transmission gap pattern sequence. The TGPRC is the number oftransmission gap patterns within the transmission gap pattern sequence.

FIG. 5 is a diagram of an uplink compressed frame gap description map.The uplink compressed frame gap description map 500 identifies uplinkcompressed mode transmission gaps in a compressed radio frame.

In a preferred embodiment, each uplink compressed mode transmission gapis identified by a label comprising a gap pattern type, at least onesystem frame number (SFN), a time slot number within the SFN indicatingthe start of the compressed frame transmission gap, and a time slotnumber within the SFN indicating the end of the compressed frametransmission gap. As stated above, the gap pattern type may be either asingle-frame gap or a double-frame gap. A single frame gap only requiresone SFN while a double-frame gap requires a beginning SFN and an endingSFN. The time slot number that starts the gap is represented byN_(first) and the time slot number that ends the gap is represented byN_(last). The values of N_(first) and N_(last) range from 0 to 14.

For example, the compressed frame gap 510 is labeled a single-frame gapwith a SFN of 551 and a N_(first) of 5 and N_(last) of 11. Thecompressed frame gap 520 is labeled a double-frame gap with a beginningSFN of 553 and an ending SFN of 554 and a N_(first) of 12 and N_(last)of 3.

The generation of the uplink compressed frame gap description map 500requires pre-computation for runtime efficiency. However, if thecompressed mode is run for a prolonged period of time, then theprocessing required for computing the uplink compressed frame gapdescription map 500 may take an unreasonable amount of time and requirea large amount of memory for storage.

In a preferred embodiment, the uplink compressed frame gap descriptionmap 500 is periodically updated and stored using a ring-buffer memoryscheme for the maintenance of the compressed frame gap description map500. A ring-buffer is a data structure that uses a single, fixed-sizebuffer as if it was connected end-to-end and operates in a circularfashion.

FIG. 6 is a flow diagram of a method 600 for detecting the overlap ofE-DCH transmissions and an uplink compressed mode transmission gap in aWTRU configured with a 2 ms TTI. In a preferred embodiment, the method600 is implemented in a WTRU at the physical layer. Implementing themethod 500 in the physical layer enables H-ARQ processes to detect anoverlap of a 2 ms TTI retransmission and the uplink compressed modetransmission gap.

In step 602, the WTRU obtains a current running system frame number(SFN) and a concerned subframe number (SubFN) for an E-DCH transmission.The concerned SubFN is the number of a subframe inside a radio frameindexed by the SFN.

In step 604, the WTRU determines whether the SFN for the E-DCHtransmission is a compressed frame. In a preferred embodiment, the WTRUis able to make this determination using the uplink compressed frame gapdescription map described above in FIG. 5. If the concerned SubFN is acompressed frame, then the WTRU proceeds to step 606. If the concernedSubFN is not a compressed frame, then there is no overlap of the E-DCHtransmission and the uplink compressed mode transmission gap.

In step 606, the WTRU computes a first subframe time slot,N_(e-ts-first), and a last subframe time slot, N_(e-ts-last), from theconcerned SubFN for the E-DCH transmission.

In step 608, the WTRU determines a compressed gap type of the SFN forthe E-DCH transmission. In a preferred embodiment, the WTRU is able toobtain the compressed gap type from the uplink compressed frame gapdescription map 500. A compressed gap type may be either a single-framegap or a double-frame gap. If the compressed gap type is a single-framegap, then the WTRU proceeds to step 610. If the compressed gap type is adouble frame gap, then the WTRU proceeds to step 612.

In step 610, the WTRU determines whether there is an overlap of E-DCHtransmissions for a single frame gap. In a single frame gap, there is notransmission overlap when a first transmit time slot, N_(e-st-first,) inthe concerned SubFN is greater than a last idle time slot, N_(last), inthe uplink compressed frame transmission gap or when a last transmittime slot, N_(e-st-last,) in the concerned SubFN is less than a firstidle time slot, N_(first), in the transmission gap. As shown above, theWTRU is able to detect an overlap for a single frame gap after at mosttwo comparisons.

In step 612, the WTRU determines whether the current SFN is a firstframe or a second frame in the double-frame gap. In a preferredembodiment, the WTRU makes this determination by comparing the currentSFN against the SFN in the uplink compressed frame gap description map500.

In step 614, the WTRU determines whether there is an overlap of E-DCHtransmissions for a double frame gap. In a double frame gap, if thecurrent SFN is first frame in the double frame gap, then there is notransmission overlap when a last transmit time slot, N_(e-ts-last), inthe concerned SubFN is less than a first idle time slot, N_(first), inthe uplink compressed mode transmission gap. In a double frame gap, ifthe current SFN is second frame in the double frame gap, then there isno transmission overlap when a first transmit time slot, N_(e-ts-first),in the concerned SubFN is greater than a last idle time slot, N_(last),in the uplink compressed mode transmission gap.

As shown above, the WTRU is able to detect an overlap for a double framegap so long as the first frame and second frame in the double-frame gapare known because the transmission gap occupies the end of the firstframe and the beginning of the second frame.

In order to detect the overlap of E-DCH transmissions and an uplinkcompressed mode transmission gap in a WTRU configured with a 10 ms TTI,the physical layer of the WTRU may indicate the status of the uplinkcompressed mode frame. The physical layer of the WTRU may use thecompressed frame gap description map 500 to notify the media accesscontrol (MAC) of the status of the uplink compressed mode frame. As aresult, if an E-DCH transmission overlaps with an uplink compressed modetransmission gap, the MAC may adjust a serving grant and scale back thepower of the E-DCH uplink transmission.

FIG. 7 is a diagram of an E-DCH subframe overlap description map 700.The E-DCH subframe overlap description map 700 is generated using theuplink compressed frame gap description map 500 and the overlapdetection method 600 described above. The E-DCH subframe overlapdescription map 700 identifies the subframe numbers for the E-DCHsubframes that overlap with uplink compressed mode transmission gaps incompressed radio frames.

In a preferred embodiment, the E-DCH subframes that overlap with uplinkcompressed mode transmission gaps are identified such that there is abeginning SubFN, SubFN_(beg), and an ending SubFN, SubFN_(end), for eachcompressed radio frame. As described above, each of the fifteen timeslots in a radio frame are grouped into five E-DCH subframes.

In the E-DCH subframe overlap description map 700, the gap slots withina compressed frame gap are consecutive and the maximum number of gapslots in the compressed frame cannot exceed seven. Therefore, there area maximum of three consecutive E-DCH subframes in a compressed radioframe.

The E-DCH subframe overlap description map 700 is computed using thefollowing:SubFN _(beg) =N _(first)/3   (Equation 4)SubFN _(end) =N _(last)/3   (Equation 5)where the values of SubFN_(beg) and SubFN_(end) range in value from 0 to4 to indicate each of the five E-DCH subframes within a radio frame.

For example, the compressed single-frame gap 710, corresponding tocompressed single-frame gap 510 in FIG. 5, with a SFN of 551 has aN_(first) of 5 and a N_(last) of 11. Using the equations above, thecompressed single-frame gap 710 has a SubFN_(beg) of 1 and a SubFN_(end)of 3.

As an additional example, the compressed double-frame gap 720,corresponding to double-frame gap 520 in FIG. 5, with a SFN of 553 has aN_(first) of 12 and a N_(last) of 14 and a SFN of 554 has a N_(first) of0 and a N_(last) of 3. Using the equations above, the compresseddouble-frame gap 720 has a SubFN_(beg) of 4 and a SubFN_(end) of 4 forthe SFN of 553 and a SubFN_(beg) of 0 and a SubFN_(end) of 1 for the SFNof 554.

The generation of the uplink compressed frame and subframe overlapdescription map 700 requires more involved pre-computation than thepre-computation required to produce an uplink compressed frame gapdescription map 500. However, the runtime efficiency is more greatlyenhanced using the uplink compressed frame and subframe overlapdescription map 700.

FIG. 8 is a flow diagram of a method 800 for checking the overlap ofE-DCH subframes and uplink compressed mode transmission gaps. For E-DCHsubframes in a compressed radio frame, the method 800 determines whethera particular E-DCH subframe overlaps with an uplink compressed modetransmission gap after at most two comparisons. In a preferredembodiment, the method 800 is implemented in a WTRU at the physicallayer.

In step 802, the WTRU obtains a current system frame number (FN), interms of SFN, and a concerned SubFN for an E-DCH transmission.

In step 804, the WTRU determines whether the SFN is a compressed frame.In a preferred embodiment, the WTRU is able to make this determinationusing the E-DCH subframe overlap description map 700 described above.

When the concerned SFN is a compressed frame, then the WTRU proceeds tostep 806. When the concerned SubFN is not a compressed frame, then thereis no overlap of the E-DCH subframe and the uplink compressed modetransmission gap.

In step 806, the WTRU determines whether there is an overlap of an E-DCHsubframe in a compressed radio frame and an uplink compressed modetransmission gap. In a preferred embodiment, the WTRU is able to makethis determination using the E-DCH subframe overlap description map 700described above.

There is no overlap when the concerned SubFN for the E-DCH transmissionis greater than an ending subframe, SubFN_(end), in the compressed radioframe. Further, there is no overlap when the concerned SubFN is lessthan a beginning subframe, SubFN_(beg), in the compressed radio frame.There is an overlap of the E-DCH subframe and the uplink compressed modetransmission gap in at all other times.

The method 800 for checking the overlap of E-DCH subframes and uplinkcompressed mode transmission gaps has improved runtime efficiencycompared to the method 600 for detecting E-DCH transmission overlaps.However, this improved efficiency requires more pre-computationoperations to create the E-DCH subframe overlap description map 700required for the method 800.

The methods disclosed above may be implemented in any type of wirelesscommunication system, as desired. By way of example, the methods may beimplemented in any type of WCDMA, CDMA2000, GERAN, FDD, EUL, FDD R6 UE,EUL, Enhanced Uplink or any other type of wireless communication system.The methods disclosed above may also be implemented in software, or onan integrated circuit, such as an application specific integratedcircuit (ASIC), multiple integrated circuits, logical programmable gatearray (LPGA), multiple LPGAs, discrete components, or a combination ofintegrated circuit(s), LPGA(s), and discrete component(s). The methoddisclosed above may be implemented in the physical layer (Layer 1), theData Link Layer (Layer 2), or the L1 control layer.

Although features and elements are described in the preferredembodiments in particular combinations, each feature or element can beused alone (without the other features and elements of the preferredembodiments) or in various combinations with or without other featuresand elements.

1. A method for detecting an overlap of an enhanced dedicated channel(E-DCH) transmission from a wireless transmit/receive unit (WTRU) and aNode B assigned uplink compressed mode transmission gap, the methodcomprising: obtaining a current system frame number (SFN) and aconcerned subframe number (SubFN) for the E-DCH transmission;determining whether the SFN for the E-DCH transmission is a compressedframe using an uplink compressed frame gap description map; computing afirst subframe time slot, N_(e-st-first), and a last subframe time slot,N_(e-st-last), using the concerned SubFN for the E-DCH transmission; anddetermining a compressed gap type of the SFN for the E-DCH transmissionusing the uplink compressed frame gap description map.
 2. The method ofclaim 1 further comprising: determining whether there is an overlap ofthe E-DCH transmission and the uplink compressed mode transmission gapwhen the SFN for the E-DCH transmission is a single frame gap type usingthe uplink compressed frame gap description map.
 3. The method of claim2 wherein there is no overlap of the E-DCH transmission and the uplinkcompressed mode transmission gap for a single frame gap type when thefirst time slot, N_(e-st-first), in an E-DCH subframe is greater thanthe last idle time slot, N_(last), in a radio frame or when the lasttime slot, N_(e-st-last), in an E-DCH subframe is less than the firstidle time slot, N_(first), in the radio frame.
 4. The method of claim 1further comprising: determining whether the SFN is a first frame or asecond frame in a double frame gap when the SFN for the E-DCHtransmission is a double frame gap type; and determining whether thereis an overlap of the E-DCH transmission and the uplink compressed modetransmission gap when the SFN for the E-DCH transmission is a doubleframe gap type using the uplink compressed frame gap description map. 5.The method of claim 4 wherein there is no E-DCH transmission overlapwhen the SFN is the first frame in the double frame gap and the lasttime slot, N_(e-ts-last), in the concerned SubFN is less than a firstidle time slot, N_(first), in the uplink compressed mode transmissiongap.
 6. The method of claim 4 wherein there is no E-DCH transmissionoverlap when the SFN is the second frame in the double frame gap and afirst time slot, N_(e-ts-first), in the concerned SubFN is greater thana last idle time slot, N_(last), in the uplink compressed modetransmission gap.
 7. The method of claim 1 wherein the uplink compressedframe gap description map is generated using an uplink compressed modegap pattern.
 8. The method of claim 1 wherein the uplink compressedframe gap description map identifies each uplink compressed modetransmission gap with a label comprising a gap pattern type, at leastone SFN, a time slot number within the SFN indicating the start of thecompressed frame transmission gap, and a time slot number within the SFNindicating the end of the compressed frame transmission gap.
 9. Themethod of claim 1 wherein the WTRU is configured with a 2 mstransmission time interval (TTI).
 10. The method of claim 1 wherein theWTRU is configured with a 10 ms transmission time interval (TTI).
 11. Amethod for checking the overlap of enhanced dedicated channel (E-DCH)subframes in an E-DCH transmission from a wireless transmit/receive unit(WTRU) and a Node B assigned uplink compressed mode transmission gap,the method comprising: obtaining a current system frame number (SFN) anda concerned subframe number (SubFN) for the E-DCH transmission;determining whether the SFN for the E-DCH transmission is a compressedframe using an E-DCH subframe overlap description map; and determiningwhether there is an overlap of the E-DCH subframe and the uplinkcompressed mode transmission gap using the E-DCH subframe overlapdescription map.
 12. The method of claim 11 wherein there is no overlapof the E-DCH subframe and the uplink compressed mode transmission gapwhen the SubFN is greater than an ending subframe, SubFN_(end), in thecompressed frame.
 13. The method of claim 11 wherein there is no overlapof the E-DCH subframe and the uplink compressed mode transmission gapwhen the SubFN is less than a beginning subframe, SubFN_(beg), in thecompressed frame.
 14. The method of claim 11 wherein the E-DCH subframeoverlap description map is generated after detecting the overlap ofE-DCH transmissions and uplink compressed mode transmission gaps usingan uplink compressed frame gap description map.
 15. The method of claim11 wherein the E-DCH subframe overlap description map identifies E-DCHsubframes that overlap with uplink compressed mode transmission gapssuch that there is a beginning SubFN, SubFN_(beg), and an ending SubFN,SubFN_(end), for the compressed radio frame.
 16. The method of claim 11wherein the WTRU is configured with a 2 ms transmission time interval(TTI).
 17. The method of claim 11 wherein the WTRU is configured with a10 ms transmission time interval (TTI).
 18. A wireless transmit/receiveunit (WTRU), the WTRU comprising: a receiver configured to receive anuplink compressed mode gap pattern, wherein the uplink compressed modegap pattern includes at least one uplink compressed transmission gap; atransmitter configured to transmit enhanced dedicated channel (E-DCH)transmissions; a processor configured to process the received uplinkcompressed mode gap pattern, generate an uplink compressed frame gapdescription map, and detect the overlap of an enhanced dedicated channeltransmission and an uplink compressed transmission gap; and a memoryconfigured to store the uplink compressed frame gap description mapgenerated by the processor.
 19. The WTRU of claim 18 wherein the uplinkcompressed frame gap description map identifies each uplink compressedmode transmission gap with a label comprising a gap pattern type, atleast one SFN, a time slot number within the SFN indicating the start ofthe compressed frame transmission gap, and a time slot number within theSFN indicating the end of the compressed frame transmission gap.
 20. TheWTRU of claim 18 wherein the processor is further configured to generatean E-DCH subframe overlap description map and check the overlap of E-DCHsubframes in an E-DCH transmission and a compressed mode transmissiongap.
 21. The WTRU of claim 20 wherein the memory is further configuredto store the E-DCH subframe overlap description map generated by theprocessor.
 22. The WTRU of claim 20 wherein the E-DCH subframe overlapdescription map identifies E-DCH subframes in an E-DCH transmission thatoverlap with uplink compressed mode transmission gaps such that there isa beginning SubFN, SubFN_(beg), and an ending SubFN, SubFN_(end). 23.The WTRU of claim 18 wherein the WTRU is configured with a 2 mstransmission time interval (TTI).
 24. The WTRU of claim 18 wherein theWTRU is configured with a 10 ms transmission time interval (TTI).